# Introductory Physics Question (Energy)

1. Mar 25, 2012

Information
In a hot water system water is heated by burning gas in a boiler.
The hot water is then stored in a tank.
For every 111J of energy released from the gas, 100 J of energy is absorbed by the water in the boiler.

Question B
The energy released from the gas but not absorbed by the boiler is 'wasted'.
Explain why this energy is of little use for further energy transfers.

Best Regards,

2. Mar 26, 2012

### Staff: Mentor

Hi Muhammad. Welcome to PF, and thank you for posting an interesting question.

As it is your question, you must show that you have thought about it before anyone can offer assistance. So what do you think might be a reason?

3. Mar 26, 2012

Hello NascentOxygen,

As you can see this is the very beginning.

I believe that the energy is wasted because you can't use it anymore as it disappears from the equation.

Best Regards,

Last edited: Mar 26, 2012
4. Mar 26, 2012

### Staff: Mentor

How does it disappear from the equation?

5. Mar 26, 2012

By not being able to use the previous energy it can not change into another form of energy.

Last edited: Mar 26, 2012
6. Mar 27, 2012

Bump, Can Someone confirm my previous message as correct.
And make corrections where needed and shed some extra light on this matter.

7. Mar 27, 2012

### azizlwl

If you have a car, just touch the exhaust or the engine.
Why wasted energy to heat those areas.
Because its the property of heat engine.

8. Mar 27, 2012

### Staff: Mentor

It is a fairly difficult though very fundamental question, MuhammadIslam. Is this a homework exercise? I think it might be too difficult for you. What year are you at school?

It might be one of those questions where you are expected to give the answer that your teacher at some stage recently told you. Have you studied in class this example of the water heater?

9. Mar 27, 2012

Hmm I need to further investigate your answer as it sounds hard Aziz,

Nascent I have had only one lesson of phsyics in my hole life, thursday I will get my next one. It is on Year 10 difficulty. (GCSE)